The ISF organizes and conducts world championship competition in women's & men's fast pitch, junior women's & junior men's fast pitch (19-and-under), women's, men's & coed slow pitch, and women's & men's modified pitch. The ISF sanctions regional championships and provides technical support to Regional (Multi-Sport) Games. Additionally the ISF qualifies teams for Olympic softball competition in coordination with the IOC. The ISF provides the official playing rules for international competition including but not limited to; Olympic Games, world championships, regional championships, regional Games and other sanctioned competitions.

List of members

The ISF considers some dependent territories, such as the British Virgin Islands, to be "countries" for the purposes of international competition. Those dependent territories compete separately from their "parent" country. There are members from every continent in the world, except Antarctica.

The national governing body for softball in each of the countries listed below is considered to be a member of the ISF.